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LB1945D Folha de dados(PDF) 9 Page - Sanyo Semicon Device |
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LB1945D Folha de dados(HTML) 9 Page - Sanyo Semicon Device |
9 / 9 page LB1945D PS No.7633-9/9 SANYO Semiconductor Co.,Ltd. assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein. SANYO Semiconductor Co.,Ltd. strives to supply high-quality high-reliability products, however, any and all semiconductor products fail or malfunction with some probability. It is possible that these probabilistic failures or malfunction could give rise to accidents or events that could endanger human lives, trouble that could give rise to smoke or fire, or accidents that could cause damage to other property. When designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. Upon using the technical information or products described herein, neither warranty nor license shall be granted with regard to intellectual property rights or any other rights of SANYO Semiconductor Co.,Ltd. or any third party. SANYO Semiconductor Co.,Ltd. shall not be liable for any claim or suits with regard to a third party's intellctual property rights which has resulted from the use of the technical information and products mentioned above. Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. Any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the SANYO Semiconductor Co.,Ltd. product that you intend to use. In the event that any or all SANYO Semiconductor Co.,Ltd. products described or contained herein are controlled under any of applicable local export control laws and regulations, such products may require the export license from the authorities concerned in accordance with the above law. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise, without the prior written consent of SANYO Semiconductor Co.,Ltd. Simplified Equations for Determining RC Component Values The equations for setting the RC oscillator circuit rise time (T1) and fall time (T2) are shown below. T1 ≈ 0.44C × R (s) T2 ≈ 0.72 × ( C × R × 1000 )/( R + 1000 ) (s) (C:220 to 4700pF, R = 10 to 150k Ω) The oscillator frequency must be set using the simplified equations shown above. Note that the triangle wave fall time (T2) is also used as the noise canceller time. Usage Notes 1. VREF Since the VREF pin is the input pin for the reference voltage that sets the current, applications must be designed so that noise does not appear on this pin. 2. Ground pins Since this IC switches high currents, the following points concerning grounding must be observed. • The fins on the package rear surface, pins 7 and 8, and pins 21 and 22 must all be grounded. • Sections of the circuit that carry large currents must be implemented with wide lines in the printed circuit pattern, and must be physically separated from the small signal system. • The E pin sense resistor (RE) must be position as close as possible to the IC ground (pin 14). • The capacitors between VCC and ground and between VBB and ground must be positioned as close as possible to the VCC and VBB pins on the printed circuit pattern. This catalog provides information as of April, 2007. Specifications and information herein are subject to change without notice. T1 T2 CR T2 Motor |
Nº de peça semelhante - LB1945D |
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Descrição semelhante - LB1945D |
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